Matrix Norm Routines

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norm

public static norm($x) : CArray

Matrix or vector Frobenius norm.

Parameters

CArray|Array $x Input array.

Returns

CArray Norm of the matrix or vector.

Examples

Example 1

$a = CArray::arange(9) - 4;
$b = CArray::reshape($a, [3, 3]);
echo CArray::norm($b);

7.745967

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det

public static det($a) : CArray

Compute the determinant of an array.

Parameters

CArray|Array $a Input array.

Returns

CArray Determinant of $a.

Examples

Example 1

$a = new CArray([[1, 2], [3, 4]]);
echo CArray::det($a);

-2.000000